easystats_spec.rb in easystats-0.3.2

- old
+ new
@@ -1,74 +1,130 @@
 require 'spec_helper'
 
 describe Array do
-  describe "#mean" do
-    it {        [].mean.should be_nil }
-    it {       [1].mean.should ==   1 }
-    it {     [1,2].mean.should == 1.5 }
-    it {   [1,2,3].mean.should ==   2 }
-    it { [1,2,3,4].mean.should == 2.5 }
-  end
+  DELTA = 0.00000000000001
 
-  describe "#average" do
-    it { [1,2,3,4].average.should == 2.5 }
-  end
+  it { should respond_to :average }
 
-  describe "#median" do
-    it {        [].median.should be_nil }
-    it {       [1].median.should ==   1 }
-    it {     [1,2].median.should == 1.5 }
-    it {   [1,2,3].median.should ==   2 }
-    it { [1,2,3,4].median.should == 2.5 }
-    it { [1,2,2,4].median.should ==   2 }
-    it { [1,3,3,4].median.should ==   3 }
-  end
+  build_stats_spec [], {
+    :mean => nil,
+    :median => nil,
+    :mode => nil,
+    :range => nil,
+    :standard_deviation => nil,
+    :sum => nil,
+    :variance => nil
+  }
 
-  describe "#mode" do
-    it {        [].mode.should be_nil }
-    it {       [1].mode.should ==   1 }
-    it {     [1,2].mode.should be_nil }
-    it {   [1,2,3].mode.should be_nil }
-    it { [1,2,3,4].mode.should be_nil }
-    it { [1,2,2,4].mode.should ==   2 }
-    it { [1,3,3,4].mode.should ==   3 }
-  end
+  build_stats_spec [0], {
+    :mean => 0,
+    :median => 0,
+    :mode => 0,
+    :range => 0,
+    :standard_deviation => 0,
+    :sum => 0,
+    :variance => 0.0
+  }
 
-  describe "#range" do
-    it {        [].range.should be_nil }
-    it {       [1].range.should == 0 }
-    it {     [1,2].range.should == 1 }
-    it {   [1,2,3].range.should == 2 }
-    it { [1,2,3,4].range.should == 3 }
-    it { [1,2,2,4].range.should == 3 }
-    it { [1,3,3,4].range.should == 3 }
-  end
+  build_stats_spec [1], {
+    :mean => 1,
+    :median => 1,
+    :mode => 1,
+    :range => 0,
+    :standard_deviation => 0,
+    :sum => 1,
+    :variance => 0.0
+  }
 
-  describe "#standard_deviation" do
-    let(:delta) { 0.00000000000001 }
+  build_stats_spec [1,2], {
+    :mean => 1.5,
+    :median => 1.5,
+    :mode => nil,
+    :range => 1,
+    :standard_deviation => 0.707106781186548,
+    :sum => 3,
+    :variance => 0.25
+  }
 
-    it {        [].standard_deviation.should be_nil }
-    it {       [1].standard_deviation.should == 0 }
-    it {     [1,2].standard_deviation.should be_within(delta).of(0.707106781186548) }
-    it {   [1,2,3].standard_deviation.should be_within(delta).of(1) }
-    it { [1,2,3,4].standard_deviation.should be_within(delta).of(1.29099444873581) }
-  end
+  build_stats_spec [1,2,3], {
+    :mean => 2,
+    :median => 2,
+    :mode => nil,
+    :range => 2,
+    :standard_deviation => 1,
+    :sum => 6,
+    :variance => 2.0 / 3.0
+  }
 
-  describe "#sum" do
-    it {        [].sum.should be_nil }
-    it {       [1].sum.should ==  1 }
-    it {     [1,2].sum.should ==  3 }
-    it {   [1,2,3].sum.should ==  6 }
-    it { [1,2,3,4].sum.should == 10 }
-    it { [1,2,2,4].sum.should ==  9 }
-    it { [1,3,3,4].sum.should == 11 }
-  end
+  build_stats_spec [1,2,3,4], {
+    :mean => 2.5,
+    :median => 2.5,
+    :mode => nil,
+    :range => 3,
+    :standard_deviation => 1.29099444873581,
+    :sum => 10,
+    :variance => 1.25
+  }
 
-  describe "#variance" do
-    it {        [].variance.should be_nil }
-    it {       [1].variance.should ==     0.0 }
-    it {     [1,2].variance.should ==    0.25 }
-    it {   [1,2,3].variance.should == 2.0/3.0 }
-    it { [1,2,3,4].variance.should ==    1.25 }
-  end
+
+  build_stats_spec [1,2,2,4], {
+    :mean => 2.25,
+    :median => 2,
+    :mode => 2,
+    :range => 3,
+    :standard_deviation => 1.2583057392117916,
+    :sum => 9,
+    :variance => 1.1875
+  }
+
+
+  build_stats_spec [1,3,3,4], {
+    :mean => 2.75,
+    :median => 3,
+    :mode => 3,
+    :range => 3,
+    :standard_deviation => 1.2583057392117916,
+    :sum => 11,
+    :variance => 1.1875
+  }
+
+  build_stats_spec (0..100).to_a, {
+    :mean => 50,
+    :median => 50,
+    :mode => nil,
+    :range => 100,
+    :standard_deviation => 29.300170647967224,
+    :sum => 5050,
+    :variance => 850.0
+  }
+
+  build_stats_spec (1..100).to_a, {
+    :mean => 50.5,
+    :median => 50.5,
+    :mode => nil,
+    :range => 99,
+    :standard_deviation => 29.011491975882016,
+    :sum => 5050,
+    :variance => 833.25
+  }
+
+  build_stats_spec [-1,0,1], {
+    :mean => 0,
+    :median => 0,
+    :mode => nil,
+    :range => 2,
+    :standard_deviation => 1,
+    :sum => 0,
+    :variance => 0.6666666666666666
+  }
+
+  build_stats_spec [1,2.5], {
+    :mean => 1.75,
+    :median => 1.75,
+    :mode => nil,
+    :range => 1.5,
+    :standard_deviation => 1.0606601717798212,
+    :sum => 3.5,
+    :variance =>0.5625
+  }
 end
 